function randomString() {
	var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
	var string_length = 4;
	var randomstring = '';
	for (var i=0; i<string_length; i++) {
		var rnum = Math.floor(Math.random() * chars.length);
		randomstring += chars.substring(rnum,rnum+1);
	}
	return randomstring;
}

function doProduct(siteID, productno){

    var str = randomString();
   	var basket = window.open('http://clk.tradedoubler.com/click?a='+siteID+'&p=67859&g=17299706&epi='+productno+'&'+str+'='+str);

}
function doDownload(siteID, trackID){

    var str = randomString();
   	var basket = window.open('http://www.entertainment.nl/epages/ent.storefront/DA/AddTracks/Basket?Tracks='+trackID+'&siteID='+siteID+'&'+str+'='+str,
                      'externebasket'+siteID,
                      'toolbar=0,location=0,scrollbars=yes,directories=0,status=0,menuBar=0,resizable=0,width=568,height=680'
                     );
}

function doBolup(productno){
 doProduct('1608504', productno);
}